Check out more pictures of Justin Bieber on “Late Night With Jimmy Fallon” after the jump.

Snapped hanging out on set with Jimmy Fallon, Justin chatted about what people can expect from Believe Acoustic: “I wanted to basically strip it down so it’s just me and an acoustic guitar. Some of it is me and a piano but most of it is just raw me. I think the fans really like it because its just kind of how I started. I started with just me on the internet. Not really with all the produced pop music, and so it’s just that it’s just really mellowed down and I feel like it’s made for all ages.”

The “Yellow Raincoat” singer also got a little jokey as he bared his KILLER abs (seriously though, every time Justin shows us his abs, Rihanna does another naked photo shoot. The pop stars are aligned), exposing another pair of his famous drop-crotch pants. (He also made out with a mannequin, but that’s another story for another time.) Look, Justin, we love that you’re fresh off the child train and currently pulling into Adult Central Station with all those rippling muscles, but come ON. Again? Not that we don’t love your tight tummy (because, gawd, we do), but augh, if you’re gonna show us your abs all the time, at least channel it into an Armani ad or something so we can peel out the magazine page and post it somewhere reputable instead of making us take all these embarrassing screen shots!